coordinateconversion.cc 9.05 KB
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#include "radixgeo/coordinateconversion.hh"
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#include "radixmath/constants.hh"
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#include <stdio.h>
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#include <algorithm>

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// forward declaration of stdio.h function
int snprintf(char* buf, size_t size, const char* fmt, ...);

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namespace radix
{
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const std::array<char, 22> UTMZones::letters = {
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    {'A', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M',
     'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Z'}};
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const std::array<short, 22> UTMZones::degrees = {
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    {-90, -84, -72, -64, -56, -48, -40, -32, -24, -16, -8,
     0,   8,   16,  24,  32,  40,  48,  56,  64,  72,  84}};
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const std::array<char, 11> UTMZones::neg_letters = {
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    {'A', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M'}};
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const std::array<short, 11> UTMZones::neg_degrees = {
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    {-90, -84, -72, -64, -56, -48, -40, -32, -24, -16, -8}};
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const std::array<char, 11> UTMZones::pos_letters = {
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    {'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Z'}};
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const std::array<short, 11> UTMZones::pos_degrees = {
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    {0, 8, 16, 24, 32, 40, 48, 56, 64, 72, 84}};
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const std::array<char, 11> UTM2LatLon::southern_hemisphere = {
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    {'A', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M'}};
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short UTMZones::latZoneDegree(char letter)
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{
  auto itr = std::find(letters.begin(), letters.end(), letter);
  if (itr == letters.end()) return -100;
  return *itr;
}

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short UTMZones::lonZone(double longitude)
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{
  double longZone = 0;
  if (longitude < 0.0)
  {
    longZone = ((180.0 + longitude) / 6) + 1;
  }
  else
  {
    longZone = (longitude / 6) + 31;
  }
  return short(longZone);
}

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char UTMZones::latZone(double latitude)
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{
  short latIndex = -2;
  short lat      = short(latitude);

  if (lat >= 0)
  {
    size_t len = pos_letters.size();
    for (size_t i = 0; i < len; i++)
    {
      if (lat == pos_degrees[i])
      {
        latIndex = i;
        break;
      }

      if (lat > pos_degrees[i])
      {
        continue;
      }
      else
      {
        latIndex = i - 1;
        break;
      }
    }
  }
  else
  {
    size_t len = neg_letters.size();
    for (size_t i = 0; i < len; i++)
    {
      if (lat == neg_degrees[i])
      {
        latIndex = i;
        break;
      }

      if (lat < neg_degrees[i])
      {
        latIndex = i - 1;
        break;
      }
      else
      {
        continue;
      }
    }
  }

  if (latIndex == -1)
  {
    latIndex = 0;
  }
  if (lat >= 0)
  {
    if (latIndex == -2)
    {
      latIndex = pos_letters.size() - 1;
    }
    return pos_letters[latIndex];
  }
  else
  {
    if (latIndex == -2)
    {
      latIndex = neg_letters.size() - 1;
    }
    return neg_letters[latIndex];
  }
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}

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double LatLon2UTM::northing(double latitude) const
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{
  double northing = m_K1 + m_K2 * m_p * m_p + m_K3 * std::pow(m_p, 4.);
  if (latitude < 0.0)
  {
    northing = 10000000. + northing;
  }
  return northing;
}

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double LatLon2UTM::easting() const
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{
  return 500000. + (m_K4 * m_p + m_K5 * std::pow(m_p, 3.));
}

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UTMCoordinate LatLon2UTM::toUTM(double latitude, double longitude)
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{
  CoordinateConversion::validate(latitude, longitude);
  UTMCoordinate utm;
  init(latitude, longitude);
  utm.longitude_zone = UTMZones::lonZone(longitude);
  utm.lattitude_zone = UTMZones::latZone(latitude);

  utm.easting  = easting();
  utm.northing = northing(latitude);
  return utm;
}

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void LatLon2UTM::init(double latitude, double longitude)
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{
  latitude = radix::toRadians(latitude);
  m_rho    = m_equatorialRadius * (double(1.) - m_e * m_e) /
          std::pow(double(1.) - std::pow(m_e * std::sin(latitude), double(2)),
                   double(3.) / double(2.0));

  m_nu = m_equatorialRadius /
         std::pow(double(1) - std::pow(m_e * std::sin(latitude), double(2)),
                  (double(1) / double(2.0)));

  double var1;
  if (longitude < double(0.))
  {
    var1 = ((int)((180 + longitude) / double(6.))) + 1;
  }
  else
  {
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    var1 = ((int)(longitude / 6.)) + 31;
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  }
  double var2 = (6 * var1) - 183;
  double var3 = longitude - var2;
  m_p         = var3 * 3600 / 10000;

  m_S = m_A0 * latitude - m_B0 * std::sin(double(2) * latitude) +
        m_C0 * std::sin(double(4) * latitude) -
        m_D0 * std::sin(double(6) * latitude) +
        m_E0 * std::sin(double(8) * latitude);

  m_K1 = m_S * m_k0;
  m_K2 = m_nu * std::sin(latitude) * std::cos(latitude) * std::pow(m_sin1, 2) *
         m_k0 * (100000000) / 2;
  m_K3 = ((std::pow(m_sin1, double(4)) * m_nu * std::sin(latitude) *
           std::pow(std::cos(latitude), double(3))) /
          double(24)) *
         (double(5) - std::pow(std::tan(latitude), double(2)) +
          double(9) * m_e1sq * std::pow(std::cos(latitude), double(2)) +
          double(4) * std::pow(m_e1sq, double(2)) *
              std::pow(std::cos(latitude), double(4))) *
         m_k0 * (10000000000000000L);

  m_K4 = m_nu * std::cos(latitude) * m_sin1 * m_k0 * double(10000);

  m_K5 = std::pow(m_sin1 * std::cos(latitude), double(3)) * (m_nu / double(6)) *
         (double(1) - std::pow(std::tan(latitude), double(2)) +
          m_e1sq * std::pow(std::cos(latitude), double(2))) *
         m_k0 * 1000000000000L;

  m_A6 = (std::pow(m_p * m_sin1, double(6)) * m_nu * std::sin(latitude) *
          std::pow(std::cos(latitude), double(5)) / double(720)) *
         (double(61) - double(58) * std::pow(std::tan(latitude), double(2)) +
          std::pow(std::tan(latitude), double(4)) +
          double(270) * m_e1sq * std::pow(std::cos(latitude), double(2)) -
          double(330) * m_e1sq * std::pow(std::sin(latitude), double(2))) *
         m_k0 * (1E+24);
}  // LatLon2UTM init

void CoordinateConversion::validate(const std::pair<double, double>& point)
{
  CoordinateConversion::validate(point.first, point.second);
}

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std::string CoordinateConversion::toString(const UTMCoordinate& utm)
{
  char buff[120];
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  snprintf(buff, sizeof(buff), "%02d %c %f %f", utm.longitude_zone,
           utm.lattitude_zone, utm.easting, utm.northing);
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  return std::string(buff);
}

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void CoordinateConversion::validate(double latitude, double longitude)
{
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  radix_tagged_line("Validating (" << latitude << "," << longitude << ")");
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  if (latitude < -90.0 || latitude > 90.0 || longitude < -180.0 ||
      longitude >= 180.0)
  {
    std::ostringstream oss;
    oss << "Invalid coordinate [" << latitude << "," << longitude
        << "].\nLatitude must be [-90,90] and longitude must be "
           "[-180,180).";
    throw std::out_of_range(oss.str());
  }
}
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void UTM2LatLon::init(const UTMCoordinate& utm)
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{
  m_arc = utm.northing / m_k0;
  m_mu  = m_arc /
         (m_a * (1. - std::pow(m_e, 2.) / 4.0 - 3. * std::pow(m_e, 4.) / 64.0 -
                 5. * std::pow(m_e, 6.) / 256.0));

  m_ei = (1. - std::pow((1. - m_e * m_e), (1. / 2.0))) /
         (1. + std::pow((1. - m_e * m_e), (1. / 2.0)));

  m_ca = 3. * m_ei / 2. - 27. * std::pow(m_ei, 3.) / 32.0;

  m_cb   = 21. * std::pow(m_ei, 2.) / 16. - 55. * std::pow(m_ei, 4.) / 32.;
  m_cc   = 151. * std::pow(m_ei, 3.) / 96.;
  m_cd   = 1097. * std::pow(m_ei, 4.) / 512.;
  m_phi1 = m_mu + m_ca * std::sin(2. * m_mu) + m_cb * std::sin(4. * m_mu) +
           m_cc * std::sin(6. * m_mu) + m_cd * std::sin(8. * m_mu);

  m_n0 =
      m_a / std::pow((1. - std::pow((m_e * std::sin(m_phi1)), 2.)), (1. / 2.0));

  m_r0 = m_a * (1. - m_e * m_e) /
         std::pow((1. - std::pow((m_e * std::sin(m_phi1)), 2.)), (3. / 2.0));
  m_fact1 = m_n0 * std::tan(m_phi1) / m_r0;

  m_a1    = 500000. - utm.easting;
  m_dd0   = m_a1 / (m_n0 * m_k0);
  m_fact2 = m_dd0 * m_dd0 / 2.;

  m_t0    = std::pow(std::tan(m_phi1), 2.);
  m_Q0    = m_e1sq * std::pow(std::cos(m_phi1), 2.);
  m_fact3 = (5. + 3. * m_t0 + 10. * m_Q0 - 4. * m_Q0 * m_Q0 - 9. * m_e1sq) *
            std::pow(m_dd0, 4.) / 24.;

  m_fact4 = (61. + 90. * m_t0 + 298. * m_Q0 + 45. * m_t0 * m_t0 -
             252. * m_e1sq - 3. * m_Q0 * m_Q0) *
            std::pow(m_dd0, 6.) / 720.;

  //
  m_lof1 = m_a1 / (m_n0 * m_k0);
  m_lof2 = (1. + 2. * m_t0 + m_Q0) * std::pow(m_dd0, 3.) / 6.0;
  m_lof3 = (5. - 2. * m_Q0 + 28. * m_t0 - 3. * std::pow(m_Q0, 2.) +
            8. * m_e1sq + 24. * std::pow(m_t0, 2.)) *
           std::pow(m_dd0, 5.) / 120.;
  m_a2 = (m_lof1 - m_lof2 + m_lof3) / std::cos(m_phi1);
  m_a3 = m_a2 * 180. / radix::PI;
}

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char UTM2LatLon::hemisphere(char latitude_zone)
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{
  auto it = std::find(std::begin(southern_hemisphere),
                      std::end(southern_hemisphere), latitude_zone);
  if (it == southern_hemisphere.end())
  {
    return 'N';
  }
  else
  {
    return 'S';
  }
}

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std::pair<double, double> UTM2LatLon::toLatLon(const UTMCoordinate& c)
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{
  UTMCoordinate utm   = c;
  double latitude     = 0.;
  double longitude    = 0.;
  char utm_hemisphere = hemisphere(utm.lattitude_zone);
  // modify for Southern hemisphere
  if ('S' == utm_hemisphere)
  {
    utm.northing = 10000000 - utm.northing;
  }
  // initialize internal memory
  init(utm);
  latitude =
      180. * (m_phi1 - m_fact1 * (m_fact2 + m_fact3 + m_fact4)) / radix::PI;

  if (utm.longitude_zone > 0)
  {
    m_zoneCM = 6 * utm.longitude_zone - 183.0;
  }
  else
  {
    m_zoneCM = 3.0;
  }

  longitude = m_zoneCM - m_a3;
  if ('S' == utm_hemisphere)
  {
    latitude = -latitude;
  }

  return std::make_pair(latitude, longitude);
}

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// UTMZones::latZone
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}  // namespace radix